Seiko Cal. 4487 - 636

The Seiko 4487-636 represents an important milestone in Seiko's 1983 lineup. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-334ed7654e14]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

38mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1983

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